Network Problem with openvz

[bibax]

Hello,

I have a network problem with an open VZ VM.
It worked well before but now I can't set up network...

I think that I didn't do any change on that VM.... or on the host...
I use Ip failover and I check mac adress and ip address for that VM and it seems to be good.
I check with an other openvz VM and I don't see any difference for these settings :

# cat /etc/redhat-release 
CentOS release 5.8 (Final)

# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
88.191.30.57    0.0.0.0         255.255.255.255 UH    0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 eth0
0.0.0.0         88.191.30.57    0.0.0.0         UG    0      0        0 eth0

# ifconfig
eth0     
 Link encap:Ethernet  HWaddr 52:54:00:00:04:1A            
inet addr:88.191.200.90  Bcast:88.191.200.90  Mask:255.255.255.255

On my host :

veth601.0 
Link encap:Ethernet  HWaddr c6:4d:a8:2f:9c:60            
adr inet6: fe80::c44d:a8ff:fe2f:9c60/64 Scope:Lien

vmbr0     
Link encap:Ethernet  HWaddr bc:30:5b:df:93:3b            
inet adr:88.191.30.57  Bcast:88.191.30.255  Masque:255.255.255.0

# pveversion  -v
pve-manager: 2.3-13 (pve-manager/2.3/7946f1f1)
running kernel: 2.6.32-18-pve
proxmox-ve-2.6.32: 2.3-88
pve-kernel-2.6.32-10-pve: 2.6.32-63
pve-kernel-2.6.32-16-pve: 2.6.32-82
pve-kernel-2.6.32-12-pve: 2.6.32-68
pve-kernel-2.6.32-18-pve: 2.6.32-88
lvm2: 2.02.95-1pve2
clvm: 2.02.95-1pve2
corosync-pve: 1.4.4-4
openais-pve: 1.1.4-2
libqb: 0.10.1-2
redhat-cluster-pve: 3.1.93-2
resource-agents-pve: 3.9.2-3
fence-agents-pve: 3.1.9-1
pve-cluster: 1.0-36
qemu-server: 2.3-18
pve-firmware: 1.0-21
libpve-common-perl: 1.0-48
libpve-access-control: 1.0-26
libpve-storage-perl: 2.3-6
vncterm: 1.0-3
vzctl: 4.0-1pve2
vzprocps: 2.0.11-2
vzquota: 3.1-1
pve-qemu-kvm: 1.4-8
ksm-control-daemon: 1.1-1

Do you have any ideas?
Can I check something more?

Thank you for your reply.

Regards